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A kind of ultra-low loss optical fiber and its preparation method

An optical fiber and ultra-low technology, applied in the field of ultra-low loss optical fiber and its preparation, which can solve the problems of the refractive index difference between the core layer and the cladding layer not meeting the requirements, increasing the attenuation of the optical fiber, and poor stability of silicon oxyfluoride.

Active Publication Date: 2020-03-31
CHENGDU FUTONG OPTICAL COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, when the VAD method is used to prepare the loose body of the core rod, the stability of the silicon oxyfluoride produced by the reaction is extremely poor, and the F element in the cladding is likely to diffuse into the loose body of the fiber core. After sintering, the refractive index of the fiber core also decreases. , the refractive index difference between the core layer and the cladding layer cannot meet the requirements, thus increasing the attenuation of the obtained fiber

Method used

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  • A kind of ultra-low loss optical fiber and its preparation method
  • A kind of ultra-low loss optical fiber and its preparation method
  • A kind of ultra-low loss optical fiber and its preparation method

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preparation example Construction

[0027] The invention provides a method for preparing an ultra-low loss optical fiber, comprising the following steps:

[0028] A) The VAD method is used to prepare the mandrel loose body which is the core layer loose body, the silica barrier layer and the cladding loose body successively from the inside to the outside, and the first blowtorch, the second blowtorch and the third blowtorch are used for deposition, and the The gas of the first blowtorch is H 2 , O 2 , Ar and SiCl 4 , forming a core layer loose body; the gas passed into the second blowtorch is H 2 and O 2 , forming a silica barrier layer, passing through the H of the second blowtorch 2 The flow rate is 12 ~ 15L / min, the O 2 The flow rate is 10 ~ 12L / min; the gas passed into the third blowtorch is H 2 , O 2 , Ar, SiCl 4 and CF 4 , forming a cladding loose body;

[0029] B) The mandrel loose body is sequentially dehydrated, sintered, extended, etched and washed, and an outer cladding is formed on the surfa...

Embodiment 1

[0053] The mandrel loose body is prepared by the VAD method, wherein the cavity of the device for preparing the mandrel loose body by the VAD method is provided with a first blowtorch, a second blowtorch and a third blowtorch arranged in sequence from bottom to top.

[0054] Wherein, the gas passed into the first torch is H 2 , O 2 , Ar and SiCl 4 , the first torch includes a centrally located supply of oxygen (indicated by O1) and SiCl 4 The raw material supply pipe of the mixed gas, and the seven-layer gas flow path arranged concentrically on the outside of the raw material supply pipe, and the seven-layer gas flow path is passed through the center of the first torch to the outside sequentially into hydrogen (indicated by H1) , hydrogen (represented by H2), argon (represented by Ar1), oxygen (represented by O2), argon (represented by Ar2), hydrogen (represented by H3) and argon (represented by Ar3); H of the first blowtorch 2 The flow rate is H1: 0.25L / min, H2: 3L / min, H...

Embodiment 2

[0068] The mandrel loose body is prepared by the VAD method, wherein the cavity of the device for preparing the mandrel loose body by the VAD method is provided with a first blowtorch, a second blowtorch and a third blowtorch arranged in sequence from bottom to top.

[0069] Wherein, the gas passed into the first torch is H 2 , O 2 , Ar and SiCl 4 , the first torch includes a centrally located supply of oxygen (indicated by O1) and SiCl 4 The raw material supply pipe of the mixed gas, and the seven-layer gas flow path arranged concentrically on the outside of the raw material supply pipe, and the seven-layer gas flow path is passed through the center of the first torch to the outside sequentially into hydrogen (indicated by H1) , hydrogen (represented by H2), argon (represented by Ar1), oxygen (represented by O2), argon (represented by Ar2), hydrogen (represented by H3) and argon (represented by Ar3); H of the first blowtorch 2 The flow rate is H1: 0.25L / min, H2: 3L / min, H...

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Abstract

The invention provides a production method of an ultralow-loss optical fiber. The method comprises the following steps: 1, producing a core rod loose body sequentially comprising a core layer loose body, a silica barrier layer and a cladding layer loose body from the inside to the outside through a VAD technology, adopting a first blowtorch, a second blowtorch and a third blowtorch to carry out deposition, introducing H2, O2, Ar and SiCl4 through the first blowtorch to form the core layer loose body, introducing H2 and O2 through the second blowtorch according to an H2 flow of 12-15 L / min and an O2 flow of 10-12 L / min to form the silica barrier layer, and introducing H2, O2, Ar, SiCl4 and CF4 through the third blowtorch to form the cladding loose body; 2, sequentially carrying out dehydration, sintering, extension and corrosive washing on the core rod loose body, and forming an outer cladding layer to obtain a prefabricated rod; and 3, wiredrawing the prefabricated rod to obtain the ultralow-loose optical fiber.

Description

technical field [0001] The invention belongs to the technical field of optical fibers, and in particular relates to an ultra-low loss optical fiber and a preparation method thereof. Background technique [0002] With the rapid development of information technology, a large amount of data information needs to be transmitted quickly and accurately. Therefore, communication optical fibers require greater communication capacity to achieve rapid transmission of large data; lower attenuation loss is required to achieve long-distance information. transmission. At present, through raw material purification and self-improvement, the optimization of the attenuation index has almost reached the limit (optimized water peak), and the attenuation has been reduced to 0.185dB / Km. To further reduce the attenuation, the only way to reduce the doping amount of the fiber core is to reduce the Rayleigh scattering loss. One way to reduce Rayleigh scattering is to not dope the core and dope the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/018C03B37/027
CPCC03B37/01815C03B37/01853C03B37/027
Inventor 陈海斌陈剑陈强李庆国简晓松
Owner CHENGDU FUTONG OPTICAL COMM TECH